<br>界面耦合 SnSe2/SnSe 异质结构作为锂离子电池的长循环负极,Advanced Science

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界面耦合 SnSe2/SnSe 异质结构作为锂离子电池的长循环负极
Advanced Science ( IF 14.3 ) Pub Date : 2022-11-18 , DOI: 10.1002/advs.202204671
Wang Feng ₁ , Xia Wen ₁ , Yuzhu Wang ₁ , Luying Song ₁ , Xiaohui Li ₁ , Ruofan Du ₁ , Junbo Yang ₁ , Hui Li ₁ , Jun He ₂ , Jianping Shi ₁

Affiliation

硒化锡（SnSe ₂ ）因其可调节的层间空间、丰富的活性位点和高理论容量而被认为是一种有前途的锂离子电池负极。然而，低电子电导率和充放电过程中较大的体积变化不可避免地导致比容量不足和循环稳定性差。本文设计了一种高通量湿化学方法来合成SnSe ₂ /SnSe异质结构并将其用作锂离子电池的负极。这种异质结构的分层纳米花形态缓冲了体积膨胀，而内置电场和金属特征则增加了电荷传输能力。正如预期的那样，由SnSe ₂ /SnSe负极组成的锂离子电池获得了优异的比容量（0.1 A g ^-1下约911.4 mAh g ^-1 ）、高倍率性能和出色的循环稳定性。更有趣的是，在1000次循环后仍保持可逆比容量（2.5 A g ^-1下约374.7 mAh g ^-1 ）。通过密度泛函理论（DFT）计算和原位表征阐明了内部锂存储机制。这项工作为通过构建异质结构来增强锂离子电池性能提供了新的范例。

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Interfacial Coupling SnSe2/SnSe Heterostructures as Long Cyclic Anodes of Lithium-Ion Battery

Tin selenide (SnSe₂) is considered a promising anode of the lithium-ion battery because of its tunable interlayer space, abundant active sites, and high theoretical capacity. However, the low electronic conductivity and large volume variation during the charging/discharging processes inevitably result in inadequate specific capacity and inferior cyclic stability. Herein, a high-throughput wet chemical method to synthesize SnSe₂/SnSe heterostructures is designed and used as anodes of lithium-ion batteries. The hierarchical nanoflower morphology of such heterostructures buffers the volume expansion, while the built-in electric field and metallic feature increase the charge transport capability. As expected, the superb specific capacity (≈911.4 mAh g⁻¹ at 0.1 A g⁻¹), high-rate performance, and outstanding cyclic stability are obtained in the lithium-ion batteries composed of SnSe₂/SnSe anodes. More intriguingly, a reversible specific capacity (≈374.7 mAh g⁻¹ at 2.5 A g⁻¹) is maintained after 1000 cycles. The internal lithium storage mechanism is clarified by density functional theory (DFT) calculations and in situ characterizations. This work hereby provides a new paradigm for enhancing lithium-ion battery performances by constructing heterostructures.

更新日期：2022-11-18

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